[mikebaronehouston]

Here is the oil filter pad. It has a third hole:

2 – Oil comes from the stock oil pump in the oil pan.

In a stock block, it goes to the oil filter.

1 – Oil goes back into the block.

In a stock block, it comes cleaned from the filter and feeds the oil galley in the driver’s side/left side of the block.

3 – 303 MAGIC. This port goes directly to the high- pressure pump.

From the pictures I have seen, there appears to be a pressure bypass here. I am stumped on what it connects.